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Commercial Paper and Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Par Value $ 16,897 $ 16,705
Carrying Value 16,783 16,754
Fair Value 17,664 18,621
Commercial Paper [Member]
    
Par Value 1,060 1,587
Commercial Paper 1,060 1,587
Debt Instrument, Fair Value Disclosure 1,060 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 0 409
Carrying Value 0 411
Fair Value 0 413
4.750% Senior Unsecured Notes Due February 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Par Value 172 172
Carrying Value 175 178
Fair Value 175 180
5.000% Senior Unsecured Notes Due August 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Par Value 389 389
Carrying Value 401 411
Fair Value 405 414
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 435 [1] 444 [1]
Fair Value 440 [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 624 [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 645 [1] 660 [1]
Fair Value 663 [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 398 397
Fair Value 409 412
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 108 110
6.000% Senior Unsecured Notes Due June 2017 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Par Value 441 441
Carrying Value 481 489
Fair Value 509 528
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 614 [1] 622 [1]
Fair Value 617 [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 168 170
Fair Value 178 191
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 1,117 1,120
Fair Value 1,282 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 482 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 474 499
4.700% Senior Unsecured Notes Due February 2021 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 4.70%  
Par Value 400 400
Carrying Value 416 417
Fair Value 437 466
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 481 [1] 512 [1]
Fair Value 499 [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 1,005 998
Fair Value 1,045 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 10 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 576 [1] 619 [1]
Fair Value 582 [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 706 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 940 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 604 659
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 795 860
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 1,381 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 332 364
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 401 440
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 572 641
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 462 521
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 536 622
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 683 0
Domestic Corporate Debt Securities [Member]
    
Par Value 16,897 16,117
Carrying Value 16,783 16,143
Fair Value 17,664 18,008
Foreign Corporate Debt Securities [Member]
    
Par Value 0 588
Carrying Value 0 611
Fair Value 0 613
CDI and 1.300% [Member] | CDI and 1.3% Subsidiary Floating debt due October 2013 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.30%  
Par Value 0 147
Carrying Value 0 148
Fair Value 0 150
CDI and 1.450% [Member] | CDI and 1.45 % Subsidiary floating debt due October 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.45%  
Par Value 0 147
Carrying Value 0 149
Fair Value 0 150
110% CDI [Member] | 110% CDI Subsidiary floating debt due December 2014 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 110.00%  
Par Value 0 147
Carrying Value 0 151
Fair Value 0 147
CDI and 1.600% [Member] | CDI and 1.6% Subsidiary floating debt due October 2015 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 1.60%  
Par Value 0 74
Carrying Value 0 76
Fair Value 0 76
Base Rate | IPCA and 7.61% Subsidiary floating debt due October 2015 [Member]
    
Debt Instrument, Interest Rate, Stated Percentage 7.61%  
Par Value 0 73
Carrying Value 0 87
Fair Value $ 0 $ 90
[1] (a)Fixed-rate debt instruments hedged with interest rate swap contracts. See below for more information on the Company’s interest rate swaps.