v3.6.0.2

SCHEDULE I, CONDENSED FINANCIAL INFORMATION OF PARENT, FOOTNOTES (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Basis of Presentation |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust investment gains |  |  |  |  |  |  |  |  |  | $ 7 | $ 6 | $ 5
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 107 |  |  |  |  |  | 107 |
Excess tax benefit |  |  |  |  |  |  |  |  |  | $ (34) | $ 0 | $ 0
Weighted-average common shares outstanding for diluted EPS | 251,600 | 252,400 | 252,000 | 251,500 | 251,500 | 251,000 | 251,500 | 251,200 |  | 251,155 | 250,923 | 250,655
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | $ (913) |  |  |  | $ (907) |  |  |  |  | $ (913) | $ (907) |
Total long-term debt | 14,429 |  |  |  | 13,134 |  |  |  |  | 14,429 | 13,134 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
2017 | 905 |  |  |  |  |  |  |  |  | 905 |  |
2018 | 1,414 |  |  |  |  |  |  |  |  | 1,414 |  |
2019 | 1,417 |  |  |  |  |  |  |  |  | 1,417 |  |
2020 | 1,032 |  |  |  |  |  |  |  |  | 1,032 |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | 107 |  |  |  |  |  | 107 |
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit |  |  |  |  |  |  |  |  |  | 34 |  |
Weighted-average common shares outstanding for diluted EPS |  |  | 98 | 75 |  |  |  |  | 89 |  |  |
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | 107 |  |  |  |  |  | 107 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust investment gains |  |  |  |  |  |  |  |  |  | $ 23 | $ 3 | $ 27
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding for diluted EPS |  |  |  |  |  |  |  |  |  | 251,155 | 250,923 | 250,655
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Market value adjustments for interest rate swaps, net | (3) |  |  |  | (2) |  |  |  |  | $ (3) | $ (2) |
Build-to-suit lease | 137 |  |  |  | 136 |  |  |  |  | 137 | 136 |
Gross long-term debt | 5,734 |  |  |  | 5,984 |  |  |  |  | 5,734 | 5,984 |
Current portion of long-term debt | (600) |  |  |  | (752) |  |  |  |  | (600) | (752) |
Unamortized discount on long-term debt | (10) |  |  |  | (10) |  |  |  |  | (10) | (10) |
Unamortized debt issuance costs | (24) |  |  |  | (27) |  |  |  |  | (24) | (27) |
Total long-term debt | 5,100 |  |  |  | 5,195 |  |  |  |  | 5,100 | 5,195 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
2017 | 600 |  |  |  |  |  |  |  |  | 600 |  |
2018 | 500 |  |  |  |  |  |  |  |  | 500 |  |
2019 | 1,000 |  |  |  |  |  |  |  |  | 1,000 |  |
2020 | 900 |  |  |  |  |  |  |  |  | 900 |  |
Thereafter | 2,600 |  |  |  |  |  |  |  |  | 2,600 |  |
Parent Company [Member] | 6.5% Notes June 1, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 0 |  |  |  | 750 |  |  |  |  | $ 0 | 750 |
Stated rate percentage | 6.50% |  |  |  |  |  |  |  |  | 6.50% |  |
Effective rate percentage | 4.77% |  |  |  |  |  |  |  |  | 4.77% |  |
Parent Company [Member] | 6.5% Notes June 1, 2016 [Member] | Fixed-to-floating Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt |  |  |  |  | 300 |  |  |  |  |  | 300 |
Parent Company [Member] | 2.3% Notes April 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 600 |  |  |  | 600 |  |  |  |  | $ 600 | 600 |
Stated rate percentage | 2.30% |  |  |  |  |  |  |  |  | 2.30% |  |
Parent Company [Member] | 6.15% Notes June 15, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 6.15% |  |  |  |  |  |  |  |  | 6.15% |  |
Parent Company [Member] | Other Long-term Debt, Due February 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 9.80% |  |  |  |  |  |  |  |  | 9.80% |  |
Parent Company [Member] | 1.625% Notes October 7, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 0 |  |  |  |  | $ 500 | 0 |
Stated rate percentage | 1.625% |  |  |  |  |  |  |  |  | 1.625% |  |
Parent Company [Member] | 2.4% Notes March 15, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 2.40% |  |  |  |  |  |  |  |  | 2.40% |  |
Parent Company [Member] | 2.85% Notes November 15, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 400 |  |  |  | 400 |  |  |  |  | $ 400 | 400 |
Stated rate percentage | 2.85% |  |  |  |  |  |  |  |  | 2.85% |  |
Parent Company [Member] | 2.875% Notes October 1, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 2.875% |  |  |  |  |  |  |  |  | 2.875% |  |
Parent Company [Member] | 4.05% Notes December 1, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 4.05% |  |  |  |  |  |  |  |  | 4.05% |  |
Parent Company [Member] | 3.55% Notes June 15, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 500 |  |  |  | 500 |  |  |  |  | $ 500 | 500 |
Stated rate percentage | 3.55% |  |  |  |  |  |  |  |  | 3.55% |  |
Parent Company [Member] | 3.75% Notes November 15, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 350 |  |  |  | 350 |  |  |  |  | $ 350 | 350 |
Stated rate percentage | 3.75% |  |  |  |  |  |  |  |  | 3.75% |  |
Parent Company [Member] | 6% Notes October 15, 2039 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt | $ 750 |  |  |  | 750 |  |  |  |  | $ 750 | 750 |
Stated rate percentage | 6.00% |  |  |  |  |  |  |  |  | 6.00% |  |
Parent Company [Member] | Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit |  |  |  |  |  |  |  |  |  | $ 17 | 34 |
Weighted-average common shares outstanding for diluted EPS |  |  | 98 | 75 |  |  |  |  | 89 |  |  |
Parent Company [Member] | Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Standards |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 49 |  |  |  |  |  | $ 49 |

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