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Commercial Paper and Long-Term Debt (Commercial Paper and Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Par Value $ 18,040 $ 16,705
Carrying Value 18,049 16,754
Fair Value 19,686 18,621
Commercial Paper [Member]
    
Par Value 1,719 1,587
Commercial Paper 1,719 1,587
Debt Instrument, Fair Value Disclosure 1,719 1,587
4.875% Senior Unsecured Notes Due February 2013 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Par Value 0 534
Carrying Value 0 534
Fair Value 0 536
4.875% Senior Unsecured Notes Due April 2013 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Par Value 409 409
Carrying Value 409 411
Fair Value 409 413
4.750% Senior Unsecured Notes Due February 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Par Value 172 172
Carrying Value 177 178
Fair Value 178 180
5.000% Senior Unsecured Notes Due August 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Par Value 389 389
Carrying Value 407 411
Fair Value 413 414
Senior Unsecured Floating-rate Notes Due August 2014 [Member]
    
Par Value 250 0
Carrying Value 250 0
Fair Value 250 0
4.875% Senior Unsecured Notes Due March 2015 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Par Value 416 [1] 416 [1]
Carrying Value 442 [1] 444 [1]
Fair Value 449 [1] 453 [1]
0.850% Senior Unsecured Notes due October 2015 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 0.85%  
Par Value 625 [1] 625 [1]
Carrying Value 626 [1] 623 [1]
Fair Value 627 [1] 627 [1]
5.375% Senior Unsecured Notes Due March 2016 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.375%  
Par Value 601 [1] 601 [1]
Carrying Value 658 [1] 660 [1]
Fair Value 677 [1] 682 [1]
1.875% of Senior Unsecured Notes Due November 2016 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.875%  
Par Value 400 400
Carrying Value 397 397
Fair Value 413 412
5.360% Senior Unsecured Notes Due November 2016 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.36%  
Par Value 95 95
Carrying Value 95 95
Fair Value 110 110
6.000% Senior Unsecured Notes Due June 2017 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Par Value 441 441
Carrying Value 486 489
Fair Value 524 528
1.400% Senior Unsecured Notes due October 2017 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.40%  
Par Value 625 [1] 625 [1]
Carrying Value 626 [1] 622 [1]
Fair Value 630 [1] 626 [1]
6.000% Senior Unsecured Notes Due November 2017 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Par Value 156 156
Carrying Value 170 170
Fair Value 186 191
6.000% Senior Unsecured Notes Due February 2018 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Par Value 1,100 1,100
Carrying Value 1,119 1,120
Fair Value 1,330 1,339
1.625% Senior Unsecured Notes Due March 2019 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.625%  
Par Value 500 0
Carrying Value 498 0
Fair Value 501 0
3.875% Senior Unsecured Notes Due October 2020 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 3.875%  
Par Value 450 450
Carrying Value 443 442
Fair Value 494 499
4.700% Senior Unsecured Notes Due February 2021 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.70%  
Par Value 400 400
Carrying Value 417 417
Fair Value 459 466
3.375% of Senior Unsecured Notes Due November 2021 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 3.375%  
Par Value 500 [1] 500 [1]
Carrying Value 514 [1] 512 [1]
Fair Value 528 [1] 533 [1]
2.875% of Senior Unsecured Notes Due March 2022 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 2.875%  
Par Value 1,100 1,100
Carrying Value 1,000 998
Fair Value 1,113 1,128
Zero Coupon Senior Unsecured Notes Due November 2022 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 0.00%  
Par Value 15 15
Carrying Value 9 9
Fair Value 11 11
2.750% Senior Unsecured Notes due February 2023 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 2.75%  
Par Value 625 [1] 625 [1]
Carrying Value 619 [1] 619 [1]
Fair Value 617 [1] 631 [1]
2.875% Senior Unsecured Notes due March 2023 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 2.875%  
Par Value 750 0
Carrying Value 747 0
Fair Value 749 0
5.800% Senior Unsecured Notes Due March 2036 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.80%  
Par Value 850 850
Carrying Value 845 845
Fair Value 1,010 1,025
6.500% Senior Unsecured Notes Due June 2037 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Par Value 500 500
Carrying Value 495 495
Fair Value 645 659
6.625% Senior Unsecured Notes Due November 2037 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.625%  
Par Value 650 650
Carrying Value 645 645
Fair Value 847 860
6.875% Senior Unsecured Notes Due February 2038 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.875%  
Par Value 1,100 1,100
Carrying Value 1,084 1,084
Fair Value 1,480 1,510
5.700% Senior Unsecured Notes Due October 2040 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.70%  
Par Value 300 300
Carrying Value 298 298
Fair Value 355 364
5.950% Senior Unsecured Notes Due February 2041 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.95%  
Par Value 350 350
Carrying Value 348 348
Fair Value 429 440
4.625% of Senior Unsecured Notes Due November 2041 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.625%  
Par Value 600 600
Carrying Value 593 593
Fair Value 625 641
4.375% of Senior Unsecured Notes Due March 2042 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.375%  
Par Value 502 502
Carrying Value 486 486
Fair Value 506 521
3.950% Senior Unsecured Notes due October 2042 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 3.95%  
Par Value 625 625
Carrying Value 611 611
Fair Value 589 622
4.250% Senior Unsecured Notes due March 2043 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.25%  
Par Value 750 0
Carrying Value 740 0
Fair Value 737 0
Domestic Corporate Debt Securities [Member]
    
Par Value 17,965 16,117
Carrying Value 17,973 16,143
Fair Value 19,610 18,008
CDI and 1.3% Subsidiary Floating debt due October 2013 [Member]
    
Debt Instrument, Floating Interest Rate, Stated Percentage 1.30%  
Par Value 0 147
Carrying Value 0 148
Fair Value 0 150
CDI and 1.45 % Subsidiary floating debt due October 2014 [Member]
    
Debt Instrument, Floating Interest Rate, Stated Percentage 1.45%  
Par Value 0 147
Carrying Value 0 149
Fair Value 0 150
110% CDI Subsidiary floating debt due December 2014 [Member]
    
Debt Instrument, Floating Interest Rate, Stated Percentage 110.00%  
Par Value 0 147
Carrying Value 0 151
Fair Value 0 147
CDI and 1.6% Subsidiary floating debt due October 2015 [Member]
    
Debt Instrument, Floating Interest Rate, Stated Percentage 1.60%  
Par Value 75 [2] 74 [2]
Carrying Value 76 [2] 76 [2]
Fair Value 76 [2] 76 [2]
IPCA and 7.61% Subsidiary floating debt due October 2015 [Member]
    
Debt Instrument, Floating Interest Rate, Stated Percentage 7.61%  
Par Value 0 73
Carrying Value 0 87
Fair Value 0 90
Foreign Corporate Debt Securities [Member]
    
Par Value 75 588
Carrying Value 76 611
Fair Value $ 76 $ 613
[1] (a)At March 31, 2013 and December 31, 2012, the Company had interest rate swap contracts with notional amounts of $3.4 billion and $2.8 billion, respectively hedging these fixed-rate debt instruments. See below for more information on the Company’s interest rate swaps.
[2] (b)The CDI + 1.6% Subsidiary floating debt due October 2015 was redeemed in April 2013. The carrying value of $76 million was classified within Current Maturities of Long-Term Debt in the Condensed Consolidated Balance Sheet as of March 31, 2013.