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Employee Benefit Plans - Defined Benefit Plans Assets Measured at Fair Value (Details) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 10,001 $ 8,878  
Assets measured at NAV | Mutual Fund      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 73 76  
U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 2,802 $ 2,493 $ 2,358
Defined benefit plan, plan assets, allocation (percent) 100.00% 100.00%  
U.S. | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 17 $ 9  
U.S. | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 263 221  
U.S. | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 447 384  
U.S. | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 325 316  
U.S. | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 78 67  
U.S. | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,252 1,119  
U.S. | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 11 45  
U.S. | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 41 $ 15  
Defined benefit plan, plan assets, allocation (percent) 6.00% 6.00%  
U.S. | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 209 $ 199  
Defined benefit plan, plan assets, allocation (percent) 8.00% 8.00%  
U.S. | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 0 $ 0  
U.S. | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 159 $ 118  
Defined benefit plan, plan assets, allocation (percent) 2.00% 2.00%  
U.S. | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 491 $ 348  
U.S. | Level 1 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 17 9  
U.S. | Level 1 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 224 182  
U.S. | Level 1 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 243 193  
U.S. | Level 1 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 1 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 7 (36)  
Plan assets, non-financial, amount 7 (36)  
U.S. | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,666 1,547  
U.S. | Level 2 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 325 316  
U.S. | Level 2 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 78 67  
U.S. | Level 2 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,252 1,119  
U.S. | Level 2 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 11 45  
U.S. | Level 2 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 2 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 31 5  
U.S. | Level 3 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 31 5 0
U.S. | Level 3 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Level 3 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 614 593  
U.S. | Assets measured at NAV | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 39 39  
U.S. | Assets measured at NAV | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 204 191  
U.S. | Assets measured at NAV | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 10 10  
U.S. | Assets measured at NAV | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 209 199  
U.S. | Assets measured at NAV | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
U.S. | Assets measured at NAV | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 152 154  
Foreign Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 7,199 $ 6,385 5,729
Defined benefit plan, plan assets, allocation (percent) 100.00% 100.00%  
Foreign Plan | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 401 $ 421  
Foreign Plan | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 234 184  
Foreign Plan | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,031 882  
Foreign Plan | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 77 47  
Foreign Plan | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 2,026 1,825  
Foreign Plan | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 921 841  
Foreign Plan | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 488 186  
Foreign Plan | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 316 $ 335  
Defined benefit plan, plan assets, allocation (percent) 4.00% 5.00%  
Foreign Plan | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 1,560 $ 1,532  
Defined benefit plan, plan assets, allocation (percent) 22.00% 24.00%  
Foreign Plan | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 86 $ 90  
Foreign Plan | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 59 $ 42  
Defined benefit plan, plan assets, allocation (percent) 15.00% 11.00%  
Foreign Plan | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 1,159 $ 1,026  
Foreign Plan | Level 1 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 401 421  
Foreign Plan | Level 1 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 178 132  
Foreign Plan | Level 1 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 559 462  
Foreign Plan | Level 1 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 1 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 21 11  
Plan assets, non-financial, amount 21 11  
Foreign Plan | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 3,927 3,284  
Foreign Plan | Level 2 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 2 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 56 52  
Foreign Plan | Level 2 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 321 302  
Foreign Plan | Level 2 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 77 47  
Foreign Plan | Level 2 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 2,026 1,825  
Foreign Plan | Level 2 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 921 841  
Foreign Plan | Level 2 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 488 186  
Foreign Plan | Level 2 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 2 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 2 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 2 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 38 31  
Foreign Plan | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 297 314 308
Foreign Plan | Level 3 | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Level 3 | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 208 219 210
Foreign Plan | Level 3 | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 3 5  
Foreign Plan | Level 3 | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 86 90 $ 92
Foreign Plan | Level 3 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,816 1,761  
Foreign Plan | Assets measured at NAV | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | International      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 151 118  
Foreign Plan | Assets measured at NAV | U.S. treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | Debt security issued by government agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | Derivatives      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 108 116  
Foreign Plan | Assets measured at NAV | Private equity/venture capital      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 1,557 1,527  
Foreign Plan | Assets measured at NAV | Guaranteed insurance contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount 0 0  
Foreign Plan | Assets measured at NAV | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total plan assets, amount $ 0 $ 0  
Fixed Income Securities | Assets measured at NAV | Mutual Fund      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit plan, plan assets, allocation (percent) 70.00% 75.00%  
Equity Securities | Assets measured at NAV | Mutual Fund      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit plan, plan assets, allocation (percent) 30.00% 25.00%