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Condensed Consolidating Financial Statements - Condensed Consolidating Statements Of Cash Flows (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities $ 2,198 $ 2,607 $ 3,828
Cash flows from investing activities:      
Capital expenditures (392) (569) (521)
Purchases of held-to-maturity securities 0 0 (500)
Maturities of held-to-maturity securities 0 500 0
Proceeds from sales of assets 9 291 102
Net cash (used) provided by investing activities (426) 200 (1,102)
Cash flows from financing activities:      
Purchases of common stock (1,996) (3,233) (3,382)
Proceeds from fixed-rate notes 992 0 0
Dividends paid (911) (873) (822)
Repayments of fixed-rate notes (500) (500) 0
Proceeds from stock option exercises 292 268 547
Net cash used by financing activities (2,169) (4,367) (3,675)
Net cash (used) provided by discontinued operations (54) (43) 36
Net decrease in cash and equivalents (451) (1,603) (913)
Cash and equivalents at beginning of year 2,785 4,388 5,301
Cash and equivalents at end of year 2,334 2,785 4,388
Parent      
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities [1] 219 50 (196)
Cash flows from investing activities:      
Capital expenditures (8) (42) (71)
Purchases of held-to-maturity securities     (500)
Maturities of held-to-maturity securities   500  
Proceeds from sales of assets   162  
Other, net 5 4 3
Net cash (used) provided by investing activities (3) 624 (568)
Cash flows from financing activities:      
Purchases of common stock (1,996) (3,233) (3,382)
Proceeds from fixed-rate notes 992    
Dividends paid (911) (873) (822)
Repayments of fixed-rate notes (500) (500)  
Proceeds from stock option exercises 292 268 547
Other, net (45) (31) (17)
Net cash used by financing activities (2,168) (4,369) (3,674)
Net cash (used) provided by discontinued operations (54) (43) 36
Cash sweep/funding by parent 1,528 2,934 2,759
Net decrease in cash and equivalents (478) (804) (1,643)
Cash and equivalents at beginning of year 1,732 2,536 4,179
Cash and equivalents at end of year 1,254 1,732 2,536
Guarantors on a Combined Basis      
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities [1] 1,914 2,202 2,798
Cash flows from investing activities:      
Capital expenditures (336) (475) (409)
Purchases of held-to-maturity securities     0
Maturities of held-to-maturity securities   0  
Proceeds from sales of assets   129  
Other, net (1) (26) (74)
Net cash (used) provided by investing activities (337) (372) (483)
Cash flows from financing activities:      
Purchases of common stock 0 0 0
Proceeds from fixed-rate notes 0    
Dividends paid 0 0 0
Repayments of fixed-rate notes 0 0  
Proceeds from stock option exercises 0 0 0
Other, net (1) 2 (1)
Net cash used by financing activities (1) 2 (1)
Net cash (used) provided by discontinued operations 0 0 0
Cash sweep/funding by parent (1,576) (1,832) (2,314)
Net decrease in cash and equivalents 0 0 0
Cash and equivalents at beginning of year 0 0 0
Cash and equivalents at end of year 0 0 0
Other Subsidiaries on a Combined Basis      
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities [1] 65 355 1,226
Cash flows from investing activities:      
Capital expenditures (48) (52) (41)
Purchases of held-to-maturity securities     0
Maturities of held-to-maturity securities   0  
Proceeds from sales of assets   0  
Other, net (38) 0 (10)
Net cash (used) provided by investing activities (86) (52) (51)
Cash flows from financing activities:      
Purchases of common stock 0 0 0
Proceeds from fixed-rate notes 0    
Dividends paid 0 0 0
Repayments of fixed-rate notes 0 0  
Proceeds from stock option exercises 0 0 0
Other, net 0 0 0
Net cash used by financing activities 0 0 0
Net cash (used) provided by discontinued operations 0 0 0
Cash sweep/funding by parent 48 (1,102) (445)
Net decrease in cash and equivalents 27 (799) 730
Cash and equivalents at beginning of year 1,053 1,852 1,122
Cash and equivalents at end of year 1,080 1,053 1,852
Total Consolidated      
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities [1] 2,198 2,607 3,828
Cash flows from investing activities:      
Capital expenditures (392) (569) (521)
Purchases of held-to-maturity securities     (500)
Maturities of held-to-maturity securities   500  
Proceeds from sales of assets   291  
Other, net (34) (22) (81)
Net cash (used) provided by investing activities (426) 200 (1,102)
Cash flows from financing activities:      
Purchases of common stock (1,996) (3,233) (3,382)
Proceeds from fixed-rate notes 992    
Dividends paid (911) (873) (822)
Repayments of fixed-rate notes (500) (500)  
Proceeds from stock option exercises 292 268 547
Other, net (46) (29) (18)
Net cash used by financing activities (2,169) (4,367) (3,675)
Net cash (used) provided by discontinued operations (54) (43) 36
Cash sweep/funding by parent 0 0 0
Net decrease in cash and equivalents (451) (1,603) (913)
Cash and equivalents at beginning of year 2,785 4,388 5,301
Cash and equivalents at end of year 2,334 2,785 4,388
Consolidating Adjustments      
Condensed Consolidating Financial Information [Line Items]      
Net cash provided by operating activities [1] 0 0 0
Cash flows from investing activities:      
Capital expenditures 0 0 0
Purchases of held-to-maturity securities     0
Maturities of held-to-maturity securities   0  
Proceeds from sales of assets   0  
Other, net 0 0 0
Net cash (used) provided by investing activities 0 0 0
Cash flows from financing activities:      
Purchases of common stock 0 0 0
Proceeds from fixed-rate notes 0    
Dividends paid 0 0 0
Repayments of fixed-rate notes 0 0  
Proceeds from stock option exercises 0 0 0
Other, net 0 0 0
Net cash used by financing activities 0 0 0
Net cash (used) provided by discontinued operations 0 0 0
Cash sweep/funding by parent 0 0 0
Net decrease in cash and equivalents 0 0 0
Cash and equivalents at beginning of year 0 0 0
Cash and equivalents at end of year $ 0 $ 0 $ 0
[1] * Continuing operations only.